chore(CI): install LLVM 18

Author: Xmader

.github/workflows/test-and-publish.yaml

@@ -92,6 +92,12 @@ jobs:
           apt-get install -y zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev # required for pyenv
           DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends tzdata
           echo "AGENT_TOOLSDIRECTORY=/" >> $GITHUB_ENV # do not use the Python installation cached for Ubuntu 22.04
+      - name: Setup LLVM
+        if: ${{ startsWith(matrix.os, 'ubuntu') && steps.cache-spidermonkey.outputs.cache-hit != 'true' }}
+        run: |
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x llvm.sh
+          ./llvm.sh 18 # install LLVM version 18
       - name: Setup Python
         if: ${{ startsWith(matrix.os, 'ubuntu') && steps.cache-spidermonkey.outputs.cache-hit != 'true' }}
         run: |